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Why are unfloated instruments with ball bearings not suitable for air navigation?

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Why are unfloated instruments with ball bearings not suitable for air navigation?

(a) Weight restrictions

(b) High drift rate

(c) Low drift rate

(d) Power restrictions

The question was asked in an online quiz.

The question is from Gyroscopes topic in section Satellite Radio Navigation  & Inertial Navigation of Avionics

1 Answer

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Best answer
Right option is (b) High drift rate

To elaborate: Gyroscopes are used as heading references. The spinning wheel, large angle, unfloated instruments with ball bearings that have drift rates on the order of 50deg/hr . and hence are useless for navigation.

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